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deksha14 06-15-2010 07:21 AM

Linux and FTP user mangement
 
Hi ,

I have an anonymous ftp configured, which is openly accessible to all.
But I want to restrict it :

1. Only some 10- 15 users have the right to upload files to the ftp folders after loggin in.

2. Everyone else (Anyone) , can download the files without logging in.

How should I do this ?

Configurations :
OS : RHEL 5.4
VSFTPD

Thanks

subho.d 06-15-2010 09:20 AM

This tips 4 ur HELP ... take back up :-)
Quote:

anon_upload_enable=NO
anon_mkdir_write_enable=NO
anon_other_write_enable=NO

alli_yas 06-15-2010 10:02 AM

Hi

This is fairly simple to achieve.

In your /etc/vsftpd/vsftpd.conf file; make sure the following line exists:

Code:

userlist_enable=YES
In RHEL/CentOS 5 this is there by default. In /etc/vsftpd there should be a file called user_list. Having the "userlist_enable=YES" as above; means that all users listed in the user_list will be DENIED access to the ftp server.

Thus this should take care of your first requirement - just ensure that your 10-15 users that should have access; are NOT in the user_list file.

To allow other users to download stuff without logging in; means basically enabling anonymous FTP read only access. To achieve this make sure the following lines are in your /etc/vsftpd/vsftpd.conf:

Code:

anonymous_enable=YES
anon_root=/my/ftp/directory

The first line will enable anonymous access (so any user can login as "anonymous" or "ftp" with no password) and the second line makes the anonymous root directory set to your ftp location. Obviously you would need to ensure that permissions allow reading of that directory (# chmod 755 /my/ftp/directory)

For the above to take effect you need to restart vsftpd:

Code:

#service vsftpd restart
This should do the trick :)

deksha14 06-16-2010 01:17 AM

This is not solving my problem.
If I do this , then I am not even able to access the ftp as anonymous(not even read files).
I also need to have a default directory to the 10-15 users.

My vsftpd.conf currently (without changes suggested by you) is as follow :

---------------------------------------------------------------------------------------------
# Example config file /etc/vsftpd/vsftpd.conf
#
# The default compiled in settings are fairly paranoid. This sample file
# loosens things up a bit, to make the ftp daemon more usable.
# Please see vsftpd.conf.5 for all compiled in defaults.
#
# READ THIS: This example file is NOT an exhaustive list of vsftpd options.
# Please read the vsftpd.conf.5 manual page to get a full idea of vsftpd's
# capabilities.
#
# Allow anonymous FTP? (Beware - allowed by default if you comment this out).
anonymous_enable=YES
anon_umask=070


#
# Uncomment this to allow local users to log in.
local_enable=YES
#
# Uncomment this to enable any form of FTP write command.
write_enable=YES
#
# Default umask for local users is 077. You may wish to change this to 022,
# if your users expect that (022 is used by most other ftpd's)
local_umask=022
#
# Uncomment this to allow the anonymous FTP user to upload files. This only
# has an effect if the above global write enable is activated. Also, you will
# obviously need to create a directory writable by the FTP user.
#anon_upload_enable=YES
anon_upload_enable=YES
#
# Uncomment this if you want the anonymous FTP user to be able to create
# new directories.
#anon_mkdir_write_enable=YES
#
# Activate directory messages - messages given to remote users when they
# go into a certain directory.
dirmessage_enable=YES
#
# The target log file can be vsftpd_log_file or xferlog_file.
# This depends on setting xferlog_std_format parameter
xferlog_enable=YES
#
# Make sure PORT transfer connections originate from port 20 (ftp-data).
connect_from_port_20=YES
#
# If you want, you can arrange for uploaded anonymous files to be owned by
# a different user. Note! Using "root" for uploaded files is not
# recommended!
#chown_uploads=YES
#chown_username=whoever
#
#chown_uploads=YES
#chown_username=ftp
download_enable=YES

# The name of log file when xferlog_enable=YES and xferlog_std_format=YES
# WARNING - changing this filename affects /etc/logrotate.d/vsftpd.log
#xferlog_file=/var/log/xferlog
#
# Switches between logging into vsftpd_log_file and xferlog_file files.
# NO writes to vsftpd_log_file, YES to xferlog_file
xferlog_std_format=YES
#
# You may change the default value for timing out an idle session.
#idle_session_timeout=600
#
# You may change the default value for timing out a data connection.
#data_connection_timeout=120
#
# It is recommended that you define on your system a unique user which the
# ftp server can use as a totally isolated and unprivileged user.
#nopriv_user=ftpsecure
#
# Enable this and the server will recognise asynchronous ABOR requests. Not
# recommended for security (the code is non-trivial). Not enabling it,
# however, may confuse older FTP clients.
#async_abor_enable=YES
#
# By default the server will pretend to allow ASCII mode but in fact ignore
# the request. Turn on the below options to have the server actually do ASCII
# mangling on files when in ASCII mode.
# Beware that on some FTP servers, ASCII support allows a denial of service
# attack (DoS) via the command "SIZE /big/file" in ASCII mode. vsftpd
# predicted this attack and has always been safe, reporting the size of the
# raw file.
# ASCII mangling is a horrible feature of the protocol.
#ascii_upload_enable=YES
#ascii_download_enable=YES
#
# You may fully customise the login banner string:
#ftpd_banner=Welcome
#
# You may specify a file of disallowed anonymous e-mail addresses. Apparently
# useful for combatting certain DoS attacks.
#deny_email_enable=YES
# (default follows)
#banned_email_file=/etc/vsftpd/banned_emails
#
# You may specify an explicit list of local users to chroot() to their home
# directory. If chroot_local_user is YES, then this list becomes a list of
# users to NOT chroot().
#chroot_list_enable=YES
chroot_list_enable=YES
#download_enable=YES
#chroot_local_user=YES
# (default follows)
#chroot_list_file=/etc/vsftpd/chroot_list
#chroot_list_file=/etc/vsftpd/chroot_list
#
# You may activate the "-R" option to the builtin ls. This is disabled by
# default to avoid remote users being able to cause excessive I/O on large
# sites. However, some broken FTP clients such as "ncftp" and "mirror" assume
# the presence of the "-R" option, so there is a strong case for enabling it.
#ls_recurse_enable=YES
#
# When "listen" directive is enabled, vsftpd runs in standalone mode and
# listens on IPv4 sockets. This directive cannot be used in conjunction
# with the listen_ipv6 directive.
listen=YES
#
# This directive enables listening on IPv6 sockets. To listen on IPv4 and IPv6
# sockets, you must run two copies of vsftpd whith two configuration files.
# Make sure, that one of the listen options is commented !!
#listen_ipv6=YES

pam_service_name=vsftpd
#userlist_enable=YES
userlist_enable=NO
tcp_wrappers=YES

-------------------------
-------------------------------------------------------------------------------------

alli_yas 06-17-2010 04:20 AM

Hi

Quote:

userlist_enable=NO
The above is your problem - as per my previous post you need to set userlist_enable=YES. Thereafter users that are in the user_list file will NOT be allowed access.

I have tested the scenario on my own RHEL 5 machine and it works 100%.

To have a default directory; you can setup what's known as a chroot jail and jail the users to a single directory - if you Google for Red Hat chroot jail you'll find step by step guides as to how to do this.

Lastly, when quoting config/code please use the Code tags.


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